It comes and goes. I only smell it when the heat first comes on, it lasts for a few moments and then disappears. I don't smell anything near the furnace, but instead in the upstairs living room. I've checked that all the vents are open, and the burners are all working inside the furnace. Air filter is clean and replaced.

What am I missing? Should I just bite the bullet and call an HVAC tech?

8 For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.

It could be a lot of things. There may be a leak in one of the connecting unions in your gas process line, an exhaust vent issue, or something else.

If you have ANY doubt, call the gas company and tell them you smell gas. They will be out quickly at no charge with a sniffer. I own one that I use for various gas applications at refineries, but that's not going to do you any good being hundreds of miles away. Like I said if you have even the slightest thought there may be a leak, call the gas company.

You could DIY it, or you could call a professional to deal with the atomized explosive potentially invading your living space.

__________________
"When the Know-Nothings get control, it will read 'all men are created equal, except negroes, and foreigners, and Catholics.' When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy.”--Abraham Lincoln

If there's a leak in the house (which it sounds like there is) the gas company will red-tag the furnace. They'll turn it off and ask you to call an HVAC company to get the problem fixed. Skip the gas company and call a pro.

If it's in a common interior location it should be, but I still wouldn't want to bet my life on it. If by chance there is a leak originating from an exterior location like next to the house, who knows. I break out my equipment about twice a year and sniff the entire system. Better to be safe than dead when it comes to gas.

If there's a leak in the house (which it sounds like there is) the gas company will red-tag the furnace. They'll turn it off and ask you to call an HVAC company to get the problem fixed. Skip the gas company and call a pro.

Yep this too. The place I am buying was vacant for a year and the gas company had me call a pro co to come out and test for leaks and then they sent a guy to varify while they were here. There wasn't any leaks fortunately or I would have had to pay the pro company to fix the problem.

It could be a lot of things. There may be a leak in one of the connecting unions in your gas process line, an exhaust vent issue, or something else.

If you have ANY doubt, call the gas company and tell them you smell gas. They will be out quickly at no charge with a sniffer. I own one that I use for various gas applications at refineries, but that's not going to do you any good being hundreds of miles away. Like I said if you have even the slightest thought there may be a leak, call the gas company.

Is it wrong that Bwana is so studly that i kind feel 'crushy' when he talks like this?

Gas dude is here now. Just a weird interaction between the water heater venting and the furnace being on that overloads the exhaust vent because of the way the vent tees together, which is why it's intermittent. Only happens when the water heater and the furnace are going at the same time.

He told me how to fix it and is just finishing up. No crazy death traps in the house. Sorry to disappoint!

Gas dude is here now. Just a weird interaction between the water heater venting and the furnace being on that overloads the exhaust vent because of the way the vent tees together, which is why it's intermittent. Only happens when the water heater and the furnace are going at the same time.

He told me how to fix it and is just finishing up. No crazy death traps in the house. Sorry to disappoint!

Glad to hear everything is cool. I experienced the exact same thing

__________________"All real Americans love the sting of battle and may God have mercy on my enemies because I wont".

'Progressivism' is nothing more than a dressed up co-opted term for 'Marxism'.